论文标题
库仑电子配对，在洛杉矶基于洛杉矶的铜层超导体的紧密结合模型中
Coulomb electron pairing in a tight-binding model of La-based cuprate superconductors
论文作者
论文摘要
我们研究了两个电子相互作用的两个电子的性质，该库仑相互作用是在基于LA的Cuprate超导体的紧密结合模型中。这种紧密结合模型的特征是先前通过高级量子化学计算获得的远距离跳跃。我们在分析上和数字上表明，库仑排斥会导致在整个系统中传播的紧凑对的形成。配对形成的机理与库仑电子对的有效窄能带的出现有关，具有保守的总能量和动量。两对形成概率对有效填充因子的依赖性最大约为20（或80）％。与最近的邻居紧密结合模型的比较表明，远距离跳跃以高对形成概率增加了相位空间体积的增加。我们猜想这里讨论的库仑电子对可能在高温超导性中起作用。
We study the properties of two electrons with Coulomb interactions in a tight-binding model of La-based cuprate superconductors. This tight-binding model is characterized by long-range hopping obtained previously by advanced quantum chemistry computations. We show analytically and numerically that the Coulomb repulsion leads to a formation of compact pairs propagating through the whole system. The mechanism of pair formation is related to the emergence of an effective narrow energy band for Coulomb electron pairs with conserved total pair energy and momentum. The dependence of the pair formation probability on an effective filling factor is obtained with a maximum around a filling factor of 20 (or 80) percent. The comparison with the case of the nearest neighbor tight-binding model shows that the long-range hopping provides an increase of the phase space volume with high pair formation probability. We conjecture that the Coulomb electron pairs discussed here may play a role in high temperature superconductivity.
